Oleg K.
Cascais, Portugal
96%
Job Success
Top Rated Plus
Mobile App Development | iOS Android | React Native | Cross-Platform
$39.00/hr
✅ Developed a Mobile app that raised over $3M (check Real Estate app Breeze in my portfolio)
✅ Improved Mobile App with over 6 MILLION Users (check Cross-platform app Rocket League)
I am a Mobile Developer with 11+ years of experience in Mobile App Development. Startup founders team up with me to turn ideas into products.
🏆 Top Rated Plus 🏆 by Upwork Upwork (Top 3%)
✔ 100% Job Success ✔ Fluent English ✔ PhD
Here’s what I can offer:
Mobile App Development:
📍iOS Mobile App Development | iPhone Mobile App Development
📍Android Mobile App Development
📍Cross-Platform Development: Flutter, React Native
📍MVP Mobile App
During the last 11 years, I developed more than 150 successful apps:
Dating app | Real Estate Mobile App | Mobile App for Charging Stations | FinTech Mobile App | Video Game Companion App | Networking Mobile App | ECommerce mobile App Development | Health Care Mobile Development | CRM
Industries I’ve worked in:
✔ Fintech mobile app development
✔ Real Estate mobile app development
✔ Social Media mobile app development
✔ Beauty mobile app development
✔ Sport mobile app development
✔ Sustainable mobile app development
✔ Marketplace mobile app development
✔ Game Companion mobile app development
✔ Healthcare mobile app development
✏️ I write articles on different topics (tech, business) on Hackernoon and The Startup.
You can easily find them by searching for @OlegKalyta.
🟢 Check out my portfolio for more!⬇️
P.S. If you have an idea or an existing system that needs enhancements, feel free to reach out. I am always up for a good conversation.
Highlighted Skills:
Mobile App Development | Mobile App Developer | Flutter App | Flutter Developer | Flutter Firebase | Flutter Dart | Flutter App Developer | App Developer | Mobile Developer | React Native | React Native Mobile App Development | Mobile App Builder | Flutter App Developer | Flutter Laravel | Mobile App Development | Mobile App Developer | Flutter App | Flutter Developer | AI Speech-to-Text | Email Design | ChatGPT Prompt | API | Startup Company | Artificial Intelligence | Health Coaching | Health | Maintenance Management | Business Applications Development | Apple Watch | SEO Content | FlutterFlow | Asset Management | App Marketplace | Health & Wellness | Blockchain Development | Blockchain | Copyright | Dating Website | SwiftUI | QA Testing | AI Audio Generation | Health & Fitness | Business Activity Monitoring Software | AI Audio Generator | Mobile App | Trademark | ChatGPT API Integration | e-Commerce | ChatGPT | Transportation | Email Automation | Email Communication | Healthcare IT | Software Maintenance |AI Text-to-Image | Loan Approval | Website Maintenance | Database Architecture | Transport Chatbot | API Development | Social Media Website | Food Delivery Application | Education | Social Networking Development | Social Networking Service | Travel | Finance & Banking Chatbot | Beauty | Entertainment | Enterprise Software Development | Enterprise Software | Sports | Sports & Fitness | Mobile App Design | Apple Watch Application | Android Smartphone | Flutter Stack | HTML | CSS | SDK development SDK | | Flutter Firebase Business with 1000+ Employees | Business with 10-99 Employees | Business with 100-999 Employees | Business with 1-9 Employees | Apple HealthKit | AI Marketplace | Waste Management & Remediation | AI App Development | Healthcare | Android App | Audio Conversion | ChatGPT API NFT Marketplace
Work history
Work history
Mobile App Development (React Native) for Social Community App
Jun 18, 2025
-
Jul 7, 2025
"Available, lot of skills, good english and efficient and fast work. I recommend"
Private earnings
App - Bug fixes and Frontend Updates
May 26, 2025
-
Jul 7, 2025
No feedback given
Private earnings
30 minute consultation
Jun 29, 2025
-
Jul 1, 2025
No feedback given
Private earnings
Skilled React Native Developer with AI Expertise
Mar 13, 2025
-
Jun 17, 2025
No feedback given
Private earnings
Cross-platform Mobile App Development (iOS / Android / React Native / Node.js)
Mar 13, 2025
-
Jun 17, 2025
No feedback given
Private earnings
Full stack React Native mobile app developer
Feb 18, 2025
-
Jun 17, 2025
No feedback given
Private earnings
30 minute consultation
May 23, 2025
-
Jun 10, 2025
No feedback given
Private earnings
30 minute consultation
May 26, 2025
-
May 26, 2025
No feedback given
Private earnings
60 minute consultation
Apr 14, 2025
-
Apr 19, 2025
Private earnings
30 minute consultation
Mar 31, 2025
-
Apr 15, 2025
Private earnings
30 minute consultation
Jul 5, 2025
-
Present
Job in progress
Private earnings
Code assessment for sow (devotional tracker app)
May 19, 2025
-
Present
Job in progress
Private earnings
React Native Developer with AI Experience
Mar 11, 2025
-
Present
Job in progress
Private earnings
Cookbook API Integration with Recipe Sharing App
Feb 23, 2023
-
Present
Job in progress
Private earnings
Oleg K. has more jobs. Create an account to review them
Skills
Skills
- Mobile App Development
- iOS
- Android
- User Authentication
- Smartphone
- User Profile Creation
- iOS Development
- App Store
- In-App Purchases
- React Native
- API
- Flutter
- Hybrid App Development
- Native App Development
- Android App Development
Project catalog
Get started working with Oleg quickly with these predefined projects.
Get started working with Oleg quickly with these predefined projects.
You will get Fintech Web Application, Mobile Application, iOS, Android App Development
From $45,000
60 days delivery
You will get Javascript, React, React Native Marketplace web/mobile development
From $30,000
40 days delivery
You will get an ECommerce Platform (Web+Mobile), iOS/Android App Development
From $35,000
48 days delivery
You will get Web/Mobile/iOS/Android real estate platform
From $45,000
60 days delivery